On 03/19/2014 02:01 PM, François Beausoleil wrote:
Hi,
Le 2014-03-19 à 16:19, Adrian Klaver a écrit :
On 03/19/2014 12:48 PM, François Beausoleil wrote:
Cross-posted from
https://dba.stackexchange.com/questions/61271/how-to-access-new-or-old-field-given-only-the-fields-name
Well two things:
1) From the above link:
Note that parameter symbols can only be used for data values — if you
want to use dynamically determined table or column names, you must
insert them into the command string textually. For example, if the
preceding query needed to be done against a dynamically selected
table, you could do this:
Is there an example missing here?
So:
Instead of 'SELECT $1 '.. use 'SELECT ' || TG_ARGV[0] || ..
2) Use NEW outside the quotes.
So:
'FROM ' NEW.*
That doesn't seem to work?
CREATE OR REPLACE FUNCTION validate_arrays_sum_equals_total() RETURNS
TRIGGER AS $$
DECLARE
total bigint;
array_sum bigint;
BEGIN
EXECUTE 'SELECT $1 FROM ' NEW.* INTO total USING TG_ARGV[0];
RAISE EXCEPTION 'Total: %, social_impressions: %', total,
NEW.social_impressions;
RETURN NEW;
END
$$ LANGUAGE plpgsql;
psql:db/functions.sql:117: ERROR: syntax error at or near "."
LINE 6: EXECUTE 'SELECT $1 FROM ' NEW.* INTO total USING TG_ARGV[0...
Some experimenting showed that NEW.* does not work. So plan B:
EXECUTE 'SELECT $1.' || TG_ARGV[0] || INTO total USING NEW;
RAISE EXCEPTION 'Total: %, social_impressions: %', total,
^
Thanks,
François
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
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